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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2007-2014 Nicira, Inc.
4 */
5
6#include <linux/etherdevice.h>
7#include <linux/if.h>
8#include <linux/if_vlan.h>
9#include <linux/jhash.h>
10#include <linux/kernel.h>
11#include <linux/list.h>
12#include <linux/mutex.h>
13#include <linux/percpu.h>
14#include <linux/rcupdate.h>
15#include <linux/rtnetlink.h>
16#include <linux/compat.h>
17#include <net/net_namespace.h>
18#include <linux/module.h>
19
20#include "datapath.h"
21#include "vport.h"
22#include "vport-internal_dev.h"
23
24static LIST_HEAD(vport_ops_list);
25
26/* Protected by RCU read lock for reading, ovs_mutex for writing. */
27static struct hlist_head *dev_table;
28#define VPORT_HASH_BUCKETS 1024
29
30/**
31 * ovs_vport_init - initialize vport subsystem
32 *
33 * Called at module load time to initialize the vport subsystem.
34 */
35int ovs_vport_init(void)
36{
37 dev_table = kcalloc(VPORT_HASH_BUCKETS, sizeof(struct hlist_head),
38 GFP_KERNEL);
39 if (!dev_table)
40 return -ENOMEM;
41
42 return 0;
43}
44
45/**
46 * ovs_vport_exit - shutdown vport subsystem
47 *
48 * Called at module exit time to shutdown the vport subsystem.
49 */
50void ovs_vport_exit(void)
51{
52 kfree(dev_table);
53}
54
55static struct hlist_head *hash_bucket(const struct net *net, const char *name)
56{
57 unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
58 return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
59}
60
61int __ovs_vport_ops_register(struct vport_ops *ops)
62{
63 int err = -EEXIST;
64 struct vport_ops *o;
65
66 ovs_lock();
67 list_for_each_entry(o, &vport_ops_list, list)
68 if (ops->type == o->type)
69 goto errout;
70
71 list_add_tail(&ops->list, &vport_ops_list);
72 err = 0;
73errout:
74 ovs_unlock();
75 return err;
76}
77EXPORT_SYMBOL_GPL(__ovs_vport_ops_register);
78
79void ovs_vport_ops_unregister(struct vport_ops *ops)
80{
81 ovs_lock();
82 list_del(&ops->list);
83 ovs_unlock();
84}
85EXPORT_SYMBOL_GPL(ovs_vport_ops_unregister);
86
87/**
88 * ovs_vport_locate - find a port that has already been created
89 *
90 * @net: network namespace
91 * @name: name of port to find
92 *
93 * Must be called with ovs or RCU read lock.
94 */
95struct vport *ovs_vport_locate(const struct net *net, const char *name)
96{
97 struct hlist_head *bucket = hash_bucket(net, name);
98 struct vport *vport;
99
100 hlist_for_each_entry_rcu(vport, bucket, hash_node,
101 lockdep_ovsl_is_held())
102 if (!strcmp(name, ovs_vport_name(vport)) &&
103 net_eq(ovs_dp_get_net(vport->dp), net))
104 return vport;
105
106 return NULL;
107}
108
109/**
110 * ovs_vport_alloc - allocate and initialize new vport
111 *
112 * @priv_size: Size of private data area to allocate.
113 * @ops: vport device ops
114 * @parms: information about new vport.
115 *
116 * Allocate and initialize a new vport defined by @ops. The vport will contain
117 * a private data area of size @priv_size that can be accessed using
118 * vport_priv(). Some parameters of the vport will be initialized from @parms.
119 * @vports that are no longer needed should be released with
120 * vport_free().
121 */
122struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
123 const struct vport_parms *parms)
124{
125 struct vport *vport;
126 size_t alloc_size;
127
128 alloc_size = sizeof(struct vport);
129 if (priv_size) {
130 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
131 alloc_size += priv_size;
132 }
133
134 vport = kzalloc(alloc_size, GFP_KERNEL);
135 if (!vport)
136 return ERR_PTR(-ENOMEM);
137
138 vport->dp = parms->dp;
139 vport->port_no = parms->port_no;
140 vport->ops = ops;
141 INIT_HLIST_NODE(&vport->dp_hash_node);
142
143 if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids)) {
144 kfree(vport);
145 return ERR_PTR(-EINVAL);
146 }
147
148 return vport;
149}
150EXPORT_SYMBOL_GPL(ovs_vport_alloc);
151
152/**
153 * ovs_vport_free - uninitialize and free vport
154 *
155 * @vport: vport to free
156 *
157 * Frees a vport allocated with vport_alloc() when it is no longer needed.
158 *
159 * The caller must ensure that an RCU grace period has passed since the last
160 * time @vport was in a datapath.
161 */
162void ovs_vport_free(struct vport *vport)
163{
164 /* vport is freed from RCU callback or error path, Therefore
165 * it is safe to use raw dereference.
166 */
167 kfree(rcu_dereference_raw(vport->upcall_portids));
168 kfree(vport);
169}
170EXPORT_SYMBOL_GPL(ovs_vport_free);
171
172static struct vport_ops *ovs_vport_lookup(const struct vport_parms *parms)
173{
174 struct vport_ops *ops;
175
176 list_for_each_entry(ops, &vport_ops_list, list)
177 if (ops->type == parms->type)
178 return ops;
179
180 return NULL;
181}
182
183/**
184 * ovs_vport_add - add vport device (for kernel callers)
185 *
186 * @parms: Information about new vport.
187 *
188 * Creates a new vport with the specified configuration (which is dependent on
189 * device type). ovs_mutex must be held.
190 */
191struct vport *ovs_vport_add(const struct vport_parms *parms)
192{
193 struct vport_ops *ops;
194 struct vport *vport;
195
196 ops = ovs_vport_lookup(parms);
197 if (ops) {
198 struct hlist_head *bucket;
199
200 if (!try_module_get(ops->owner))
201 return ERR_PTR(-EAFNOSUPPORT);
202
203 vport = ops->create(parms);
204 if (IS_ERR(vport)) {
205 module_put(ops->owner);
206 return vport;
207 }
208
209 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
210 ovs_vport_name(vport));
211 hlist_add_head_rcu(&vport->hash_node, bucket);
212 return vport;
213 }
214
215 /* Unlock to attempt module load and return -EAGAIN if load
216 * was successful as we need to restart the port addition
217 * workflow.
218 */
219 ovs_unlock();
220 request_module("vport-type-%d", parms->type);
221 ovs_lock();
222
223 if (!ovs_vport_lookup(parms))
224 return ERR_PTR(-EAFNOSUPPORT);
225 else
226 return ERR_PTR(-EAGAIN);
227}
228
229/**
230 * ovs_vport_set_options - modify existing vport device (for kernel callers)
231 *
232 * @vport: vport to modify.
233 * @options: New configuration.
234 *
235 * Modifies an existing device with the specified configuration (which is
236 * dependent on device type). ovs_mutex must be held.
237 */
238int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
239{
240 if (!vport->ops->set_options)
241 return -EOPNOTSUPP;
242 return vport->ops->set_options(vport, options);
243}
244
245/**
246 * ovs_vport_del - delete existing vport device
247 *
248 * @vport: vport to delete.
249 *
250 * Detaches @vport from its datapath and destroys it. ovs_mutex must
251 * be held.
252 */
253void ovs_vport_del(struct vport *vport)
254{
255 hlist_del_rcu(&vport->hash_node);
256 module_put(vport->ops->owner);
257 vport->ops->destroy(vport);
258}
259
260/**
261 * ovs_vport_get_stats - retrieve device stats
262 *
263 * @vport: vport from which to retrieve the stats
264 * @stats: location to store stats
265 *
266 * Retrieves transmit, receive, and error stats for the given device.
267 *
268 * Must be called with ovs_mutex or rcu_read_lock.
269 */
270void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
271{
272 const struct rtnl_link_stats64 *dev_stats;
273 struct rtnl_link_stats64 temp;
274
275 dev_stats = dev_get_stats(vport->dev, &temp);
276 stats->rx_errors = dev_stats->rx_errors;
277 stats->tx_errors = dev_stats->tx_errors;
278 stats->tx_dropped = dev_stats->tx_dropped;
279 stats->rx_dropped = dev_stats->rx_dropped;
280
281 stats->rx_bytes = dev_stats->rx_bytes;
282 stats->rx_packets = dev_stats->rx_packets;
283 stats->tx_bytes = dev_stats->tx_bytes;
284 stats->tx_packets = dev_stats->tx_packets;
285}
286
287/**
288 * ovs_vport_get_options - retrieve device options
289 *
290 * @vport: vport from which to retrieve the options.
291 * @skb: sk_buff where options should be appended.
292 *
293 * Retrieves the configuration of the given device, appending an
294 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
295 * vport-specific attributes to @skb.
296 *
297 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
298 * negative error code if a real error occurred. If an error occurs, @skb is
299 * left unmodified.
300 *
301 * Must be called with ovs_mutex or rcu_read_lock.
302 */
303int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
304{
305 struct nlattr *nla;
306 int err;
307
308 if (!vport->ops->get_options)
309 return 0;
310
311 nla = nla_nest_start_noflag(skb, OVS_VPORT_ATTR_OPTIONS);
312 if (!nla)
313 return -EMSGSIZE;
314
315 err = vport->ops->get_options(vport, skb);
316 if (err) {
317 nla_nest_cancel(skb, nla);
318 return err;
319 }
320
321 nla_nest_end(skb, nla);
322 return 0;
323}
324
325/**
326 * ovs_vport_set_upcall_portids - set upcall portids of @vport.
327 *
328 * @vport: vport to modify.
329 * @ids: new configuration, an array of port ids.
330 *
331 * Sets the vport's upcall_portids to @ids.
332 *
333 * Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed
334 * as an array of U32.
335 *
336 * Must be called with ovs_mutex.
337 */
338int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids)
339{
340 struct vport_portids *old, *vport_portids;
341
342 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
343 return -EINVAL;
344
345 old = ovsl_dereference(vport->upcall_portids);
346
347 vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids),
348 GFP_KERNEL);
349 if (!vport_portids)
350 return -ENOMEM;
351
352 vport_portids->n_ids = nla_len(ids) / sizeof(u32);
353 vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids);
354 nla_memcpy(vport_portids->ids, ids, nla_len(ids));
355
356 rcu_assign_pointer(vport->upcall_portids, vport_portids);
357
358 if (old)
359 kfree_rcu(old, rcu);
360 return 0;
361}
362
363/**
364 * ovs_vport_get_upcall_portids - get the upcall_portids of @vport.
365 *
366 * @vport: vport from which to retrieve the portids.
367 * @skb: sk_buff where portids should be appended.
368 *
369 * Retrieves the configuration of the given vport, appending the
370 * %OVS_VPORT_ATTR_UPCALL_PID attribute which is the array of upcall
371 * portids to @skb.
372 *
373 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room.
374 * If an error occurs, @skb is left unmodified. Must be called with
375 * ovs_mutex or rcu_read_lock.
376 */
377int ovs_vport_get_upcall_portids(const struct vport *vport,
378 struct sk_buff *skb)
379{
380 struct vport_portids *ids;
381
382 ids = rcu_dereference_ovsl(vport->upcall_portids);
383
384 if (vport->dp->user_features & OVS_DP_F_VPORT_PIDS)
385 return nla_put(skb, OVS_VPORT_ATTR_UPCALL_PID,
386 ids->n_ids * sizeof(u32), (void *)ids->ids);
387 else
388 return nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, ids->ids[0]);
389}
390
391/**
392 * ovs_vport_find_upcall_portid - find the upcall portid to send upcall.
393 *
394 * @vport: vport from which the missed packet is received.
395 * @skb: skb that the missed packet was received.
396 *
397 * Uses the skb_get_hash() to select the upcall portid to send the
398 * upcall.
399 *
400 * Returns the portid of the target socket. Must be called with rcu_read_lock.
401 */
402u32 ovs_vport_find_upcall_portid(const struct vport *vport,
403 struct sk_buff *skb)
404{
405 struct vport_portids *ids;
406 u32 ids_index;
407 u32 hash;
408
409 ids = rcu_dereference(vport->upcall_portids);
410
411 /* If there is only one portid, select it in the fast-path. */
412 if (ids->n_ids == 1)
413 return ids->ids[0];
414
415 hash = skb_get_hash(skb);
416 ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids);
417 return ids->ids[ids_index];
418}
419
420/**
421 * ovs_vport_receive - pass up received packet to the datapath for processing
422 *
423 * @vport: vport that received the packet
424 * @skb: skb that was received
425 * @tun_info: tunnel (if any) that carried packet
426 *
427 * Must be called with rcu_read_lock. The packet cannot be shared and
428 * skb->data should point to the Ethernet header.
429 */
430int ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
431 const struct ip_tunnel_info *tun_info)
432{
433 struct sw_flow_key key;
434 int error;
435
436 OVS_CB(skb)->input_vport = vport;
437 OVS_CB(skb)->mru = 0;
438 OVS_CB(skb)->cutlen = 0;
439 if (unlikely(dev_net(skb->dev) != ovs_dp_get_net(vport->dp))) {
440 u32 mark;
441
442 mark = skb->mark;
443 skb_scrub_packet(skb, true);
444 skb->mark = mark;
445 tun_info = NULL;
446 }
447
448 /* Extract flow from 'skb' into 'key'. */
449 error = ovs_flow_key_extract(tun_info, skb, &key);
450 if (unlikely(error)) {
451 kfree_skb(skb);
452 return error;
453 }
454 ovs_dp_process_packet(skb, &key);
455 return 0;
456}
457
458static int packet_length(const struct sk_buff *skb,
459 struct net_device *dev)
460{
461 int length = skb->len - dev->hard_header_len;
462
463 if (!skb_vlan_tag_present(skb) &&
464 eth_type_vlan(skb->protocol))
465 length -= VLAN_HLEN;
466
467 /* Don't subtract for multiple VLAN tags. Most (all?) drivers allow
468 * (ETH_LEN + VLAN_HLEN) in addition to the mtu value, but almost none
469 * account for 802.1ad. e.g. is_skb_forwardable().
470 */
471
472 return length > 0 ? length : 0;
473}
474
475void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto)
476{
477 int mtu = vport->dev->mtu;
478
479 switch (vport->dev->type) {
480 case ARPHRD_NONE:
481 if (mac_proto == MAC_PROTO_ETHERNET) {
482 skb_reset_network_header(skb);
483 skb_reset_mac_len(skb);
484 skb->protocol = htons(ETH_P_TEB);
485 } else if (mac_proto != MAC_PROTO_NONE) {
486 WARN_ON_ONCE(1);
487 goto drop;
488 }
489 break;
490 case ARPHRD_ETHER:
491 if (mac_proto != MAC_PROTO_ETHERNET)
492 goto drop;
493 break;
494 default:
495 goto drop;
496 }
497
498 if (unlikely(packet_length(skb, vport->dev) > mtu &&
499 !skb_is_gso(skb))) {
500 vport->dev->stats.tx_errors++;
501 if (vport->dev->flags & IFF_UP)
502 net_warn_ratelimited("%s: dropped over-mtu packet: "
503 "%d > %d\n", vport->dev->name,
504 packet_length(skb, vport->dev),
505 mtu);
506 goto drop;
507 }
508
509 skb->dev = vport->dev;
510 skb->tstamp = 0;
511 vport->ops->send(skb);
512 return;
513
514drop:
515 kfree_skb(skb);
516}
1/*
2 * Copyright (c) 2007-2014 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19#include <linux/etherdevice.h>
20#include <linux/if.h>
21#include <linux/if_vlan.h>
22#include <linux/jhash.h>
23#include <linux/kernel.h>
24#include <linux/list.h>
25#include <linux/mutex.h>
26#include <linux/percpu.h>
27#include <linux/rcupdate.h>
28#include <linux/rtnetlink.h>
29#include <linux/compat.h>
30#include <net/net_namespace.h>
31#include <linux/module.h>
32
33#include "datapath.h"
34#include "vport.h"
35#include "vport-internal_dev.h"
36
37static LIST_HEAD(vport_ops_list);
38
39/* Protected by RCU read lock for reading, ovs_mutex for writing. */
40static struct hlist_head *dev_table;
41#define VPORT_HASH_BUCKETS 1024
42
43/**
44 * ovs_vport_init - initialize vport subsystem
45 *
46 * Called at module load time to initialize the vport subsystem.
47 */
48int ovs_vport_init(void)
49{
50 dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
51 GFP_KERNEL);
52 if (!dev_table)
53 return -ENOMEM;
54
55 return 0;
56}
57
58/**
59 * ovs_vport_exit - shutdown vport subsystem
60 *
61 * Called at module exit time to shutdown the vport subsystem.
62 */
63void ovs_vport_exit(void)
64{
65 kfree(dev_table);
66}
67
68static struct hlist_head *hash_bucket(const struct net *net, const char *name)
69{
70 unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
71 return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
72}
73
74int __ovs_vport_ops_register(struct vport_ops *ops)
75{
76 int err = -EEXIST;
77 struct vport_ops *o;
78
79 ovs_lock();
80 list_for_each_entry(o, &vport_ops_list, list)
81 if (ops->type == o->type)
82 goto errout;
83
84 list_add_tail(&ops->list, &vport_ops_list);
85 err = 0;
86errout:
87 ovs_unlock();
88 return err;
89}
90EXPORT_SYMBOL_GPL(__ovs_vport_ops_register);
91
92void ovs_vport_ops_unregister(struct vport_ops *ops)
93{
94 ovs_lock();
95 list_del(&ops->list);
96 ovs_unlock();
97}
98EXPORT_SYMBOL_GPL(ovs_vport_ops_unregister);
99
100/**
101 * ovs_vport_locate - find a port that has already been created
102 *
103 * @name: name of port to find
104 *
105 * Must be called with ovs or RCU read lock.
106 */
107struct vport *ovs_vport_locate(const struct net *net, const char *name)
108{
109 struct hlist_head *bucket = hash_bucket(net, name);
110 struct vport *vport;
111
112 hlist_for_each_entry_rcu(vport, bucket, hash_node)
113 if (!strcmp(name, ovs_vport_name(vport)) &&
114 net_eq(ovs_dp_get_net(vport->dp), net))
115 return vport;
116
117 return NULL;
118}
119
120/**
121 * ovs_vport_alloc - allocate and initialize new vport
122 *
123 * @priv_size: Size of private data area to allocate.
124 * @ops: vport device ops
125 *
126 * Allocate and initialize a new vport defined by @ops. The vport will contain
127 * a private data area of size @priv_size that can be accessed using
128 * vport_priv(). vports that are no longer needed should be released with
129 * vport_free().
130 */
131struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
132 const struct vport_parms *parms)
133{
134 struct vport *vport;
135 size_t alloc_size;
136
137 alloc_size = sizeof(struct vport);
138 if (priv_size) {
139 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
140 alloc_size += priv_size;
141 }
142
143 vport = kzalloc(alloc_size, GFP_KERNEL);
144 if (!vport)
145 return ERR_PTR(-ENOMEM);
146
147 vport->dp = parms->dp;
148 vport->port_no = parms->port_no;
149 vport->ops = ops;
150 INIT_HLIST_NODE(&vport->dp_hash_node);
151
152 if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids)) {
153 kfree(vport);
154 return ERR_PTR(-EINVAL);
155 }
156
157 return vport;
158}
159EXPORT_SYMBOL_GPL(ovs_vport_alloc);
160
161/**
162 * ovs_vport_free - uninitialize and free vport
163 *
164 * @vport: vport to free
165 *
166 * Frees a vport allocated with vport_alloc() when it is no longer needed.
167 *
168 * The caller must ensure that an RCU grace period has passed since the last
169 * time @vport was in a datapath.
170 */
171void ovs_vport_free(struct vport *vport)
172{
173 /* vport is freed from RCU callback or error path, Therefore
174 * it is safe to use raw dereference.
175 */
176 kfree(rcu_dereference_raw(vport->upcall_portids));
177 kfree(vport);
178}
179EXPORT_SYMBOL_GPL(ovs_vport_free);
180
181static struct vport_ops *ovs_vport_lookup(const struct vport_parms *parms)
182{
183 struct vport_ops *ops;
184
185 list_for_each_entry(ops, &vport_ops_list, list)
186 if (ops->type == parms->type)
187 return ops;
188
189 return NULL;
190}
191
192/**
193 * ovs_vport_add - add vport device (for kernel callers)
194 *
195 * @parms: Information about new vport.
196 *
197 * Creates a new vport with the specified configuration (which is dependent on
198 * device type). ovs_mutex must be held.
199 */
200struct vport *ovs_vport_add(const struct vport_parms *parms)
201{
202 struct vport_ops *ops;
203 struct vport *vport;
204
205 ops = ovs_vport_lookup(parms);
206 if (ops) {
207 struct hlist_head *bucket;
208
209 if (!try_module_get(ops->owner))
210 return ERR_PTR(-EAFNOSUPPORT);
211
212 vport = ops->create(parms);
213 if (IS_ERR(vport)) {
214 module_put(ops->owner);
215 return vport;
216 }
217
218 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
219 ovs_vport_name(vport));
220 hlist_add_head_rcu(&vport->hash_node, bucket);
221 return vport;
222 }
223
224 /* Unlock to attempt module load and return -EAGAIN if load
225 * was successful as we need to restart the port addition
226 * workflow.
227 */
228 ovs_unlock();
229 request_module("vport-type-%d", parms->type);
230 ovs_lock();
231
232 if (!ovs_vport_lookup(parms))
233 return ERR_PTR(-EAFNOSUPPORT);
234 else
235 return ERR_PTR(-EAGAIN);
236}
237
238/**
239 * ovs_vport_set_options - modify existing vport device (for kernel callers)
240 *
241 * @vport: vport to modify.
242 * @options: New configuration.
243 *
244 * Modifies an existing device with the specified configuration (which is
245 * dependent on device type). ovs_mutex must be held.
246 */
247int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
248{
249 if (!vport->ops->set_options)
250 return -EOPNOTSUPP;
251 return vport->ops->set_options(vport, options);
252}
253
254/**
255 * ovs_vport_del - delete existing vport device
256 *
257 * @vport: vport to delete.
258 *
259 * Detaches @vport from its datapath and destroys it. ovs_mutex must
260 * be held.
261 */
262void ovs_vport_del(struct vport *vport)
263{
264 ASSERT_OVSL();
265
266 hlist_del_rcu(&vport->hash_node);
267 module_put(vport->ops->owner);
268 vport->ops->destroy(vport);
269}
270
271/**
272 * ovs_vport_get_stats - retrieve device stats
273 *
274 * @vport: vport from which to retrieve the stats
275 * @stats: location to store stats
276 *
277 * Retrieves transmit, receive, and error stats for the given device.
278 *
279 * Must be called with ovs_mutex or rcu_read_lock.
280 */
281void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
282{
283 const struct rtnl_link_stats64 *dev_stats;
284 struct rtnl_link_stats64 temp;
285
286 dev_stats = dev_get_stats(vport->dev, &temp);
287 stats->rx_errors = dev_stats->rx_errors;
288 stats->tx_errors = dev_stats->tx_errors;
289 stats->tx_dropped = dev_stats->tx_dropped;
290 stats->rx_dropped = dev_stats->rx_dropped;
291
292 stats->rx_bytes = dev_stats->rx_bytes;
293 stats->rx_packets = dev_stats->rx_packets;
294 stats->tx_bytes = dev_stats->tx_bytes;
295 stats->tx_packets = dev_stats->tx_packets;
296}
297
298/**
299 * ovs_vport_get_options - retrieve device options
300 *
301 * @vport: vport from which to retrieve the options.
302 * @skb: sk_buff where options should be appended.
303 *
304 * Retrieves the configuration of the given device, appending an
305 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
306 * vport-specific attributes to @skb.
307 *
308 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
309 * negative error code if a real error occurred. If an error occurs, @skb is
310 * left unmodified.
311 *
312 * Must be called with ovs_mutex or rcu_read_lock.
313 */
314int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
315{
316 struct nlattr *nla;
317 int err;
318
319 if (!vport->ops->get_options)
320 return 0;
321
322 nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
323 if (!nla)
324 return -EMSGSIZE;
325
326 err = vport->ops->get_options(vport, skb);
327 if (err) {
328 nla_nest_cancel(skb, nla);
329 return err;
330 }
331
332 nla_nest_end(skb, nla);
333 return 0;
334}
335
336/**
337 * ovs_vport_set_upcall_portids - set upcall portids of @vport.
338 *
339 * @vport: vport to modify.
340 * @ids: new configuration, an array of port ids.
341 *
342 * Sets the vport's upcall_portids to @ids.
343 *
344 * Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed
345 * as an array of U32.
346 *
347 * Must be called with ovs_mutex.
348 */
349int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids)
350{
351 struct vport_portids *old, *vport_portids;
352
353 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
354 return -EINVAL;
355
356 old = ovsl_dereference(vport->upcall_portids);
357
358 vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids),
359 GFP_KERNEL);
360 if (!vport_portids)
361 return -ENOMEM;
362
363 vport_portids->n_ids = nla_len(ids) / sizeof(u32);
364 vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids);
365 nla_memcpy(vport_portids->ids, ids, nla_len(ids));
366
367 rcu_assign_pointer(vport->upcall_portids, vport_portids);
368
369 if (old)
370 kfree_rcu(old, rcu);
371 return 0;
372}
373
374/**
375 * ovs_vport_get_upcall_portids - get the upcall_portids of @vport.
376 *
377 * @vport: vport from which to retrieve the portids.
378 * @skb: sk_buff where portids should be appended.
379 *
380 * Retrieves the configuration of the given vport, appending the
381 * %OVS_VPORT_ATTR_UPCALL_PID attribute which is the array of upcall
382 * portids to @skb.
383 *
384 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room.
385 * If an error occurs, @skb is left unmodified. Must be called with
386 * ovs_mutex or rcu_read_lock.
387 */
388int ovs_vport_get_upcall_portids(const struct vport *vport,
389 struct sk_buff *skb)
390{
391 struct vport_portids *ids;
392
393 ids = rcu_dereference_ovsl(vport->upcall_portids);
394
395 if (vport->dp->user_features & OVS_DP_F_VPORT_PIDS)
396 return nla_put(skb, OVS_VPORT_ATTR_UPCALL_PID,
397 ids->n_ids * sizeof(u32), (void *)ids->ids);
398 else
399 return nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, ids->ids[0]);
400}
401
402/**
403 * ovs_vport_find_upcall_portid - find the upcall portid to send upcall.
404 *
405 * @vport: vport from which the missed packet is received.
406 * @skb: skb that the missed packet was received.
407 *
408 * Uses the skb_get_hash() to select the upcall portid to send the
409 * upcall.
410 *
411 * Returns the portid of the target socket. Must be called with rcu_read_lock.
412 */
413u32 ovs_vport_find_upcall_portid(const struct vport *vport, struct sk_buff *skb)
414{
415 struct vport_portids *ids;
416 u32 ids_index;
417 u32 hash;
418
419 ids = rcu_dereference(vport->upcall_portids);
420
421 if (ids->n_ids == 1 && ids->ids[0] == 0)
422 return 0;
423
424 hash = skb_get_hash(skb);
425 ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids);
426 return ids->ids[ids_index];
427}
428
429/**
430 * ovs_vport_receive - pass up received packet to the datapath for processing
431 *
432 * @vport: vport that received the packet
433 * @skb: skb that was received
434 * @tun_key: tunnel (if any) that carried packet
435 *
436 * Must be called with rcu_read_lock. The packet cannot be shared and
437 * skb->data should point to the Ethernet header.
438 */
439int ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
440 const struct ip_tunnel_info *tun_info)
441{
442 struct sw_flow_key key;
443 int error;
444
445 OVS_CB(skb)->input_vport = vport;
446 OVS_CB(skb)->mru = 0;
447 if (unlikely(dev_net(skb->dev) != ovs_dp_get_net(vport->dp))) {
448 u32 mark;
449
450 mark = skb->mark;
451 skb_scrub_packet(skb, true);
452 skb->mark = mark;
453 tun_info = NULL;
454 }
455
456 /* Extract flow from 'skb' into 'key'. */
457 error = ovs_flow_key_extract(tun_info, skb, &key);
458 if (unlikely(error)) {
459 kfree_skb(skb);
460 return error;
461 }
462 ovs_dp_process_packet(skb, &key);
463 return 0;
464}
465EXPORT_SYMBOL_GPL(ovs_vport_receive);
466
467static void free_vport_rcu(struct rcu_head *rcu)
468{
469 struct vport *vport = container_of(rcu, struct vport, rcu);
470
471 ovs_vport_free(vport);
472}
473
474void ovs_vport_deferred_free(struct vport *vport)
475{
476 if (!vport)
477 return;
478
479 call_rcu(&vport->rcu, free_vport_rcu);
480}
481EXPORT_SYMBOL_GPL(ovs_vport_deferred_free);
482
483static unsigned int packet_length(const struct sk_buff *skb)
484{
485 unsigned int length = skb->len - ETH_HLEN;
486
487 if (skb->protocol == htons(ETH_P_8021Q))
488 length -= VLAN_HLEN;
489
490 return length;
491}
492
493void ovs_vport_send(struct vport *vport, struct sk_buff *skb)
494{
495 int mtu = vport->dev->mtu;
496
497 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
498 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
499 vport->dev->name,
500 packet_length(skb), mtu);
501 vport->dev->stats.tx_errors++;
502 goto drop;
503 }
504
505 skb->dev = vport->dev;
506 vport->ops->send(skb);
507 return;
508
509drop:
510 kfree_skb(skb);
511}